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(No ModeL) C. PRIESTLANB.

KNOB.

No. 319,848. Patented June 9, 1885.

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KNOB.

SPECIFICATION forming part of Letters Patent No. 319,848, dated June 9, 1885. Application filed December 19, 18811. (No model.) Patented in England February D, 1884, No. 3,004.

f To @ZZ whom, it may concern:

Be it known that l, CHARLES PRresrLAND, tool-maker, a subject of the Queen of Great Brit-ain, residing at- Birmingham, England, have invented a new and useful Improvement in Knobs, (for which I have obtained a patent in Great Britain, No. 3,004, bearing date February 9, 1884,) of which the following is a specification, reference being had tothe accompanying drawings.

This invention consists of an improved knob suitable for use in the locks of doors and for various other purposes, whereby the knob, although made in two pieces, will yet be firm and not liable to turn round, ashereinunder further mentioned. rIhe method more generally adopted for making a metal knob is to make it in two parts. The neck or portion t-hat iits on the square or other shaped spindle isusually made of cast metal, the elliptical portion being made out of a plate of ductile metal stamped into the desired shape. The

elliptical portion is usually formed with one part of the complete ellipse removed or left out, thus leaving a circular hole corresponding in dimensions to the upper face of the cast neck. The elliptical part is then pressed into a groove provided in the Lipper face of the cast neck, thus forming the complete knob. The torsion pressure constantly brought to bear in turning the knob frequently loosens the elliptical portion from the neck, the result being that a person attempting to open a door by means of a door-knob fixed tothe spindle of a lock would, instead of turning the spindle, merely rotate the elliptical part of the knob round the groove in the cast neck of the said knob, and thus be unable to open the door.

This invention will effectually prevent the elliptical portion of the knob from getting loose; and it consists of the following arrangement of parts: A cast metal neck is made of a suitable and convenient form to receive al square or round spindle at one end and formed into acircular groove at the other end. In the groove at the upper end of said neck are provided four or more longitudinal openings or slots, which may be one-fourth of an inch by one-sixteenth of an inch, more or less, according to the size of the knob.

lIhe elliptical portion is formed in the following manuer: A blank is cut out 'of a plate, F, of metal, which, viewed on its horizontal plane, presents a perfect circle with four or more angular-shaped ears projecting from the edge ofthe circle. This blank isthen pressed or stamped into the desired elliptical shape. The outside circular edge with the projecting ears on it is, by the process of stamping or pressing, bent over to form that face which connects with the neck. Looking at the elfiptical portion of the knob on its vertical plane with its greatest dimensions from left to right) after it has been stamped orpressed to the required form out of the blank,four or more projecting ears present themselves to View in a convenient position to enter the before-mentioned openings or slots in the upper portion of the neck. The elliptical portion of the knob is then placed over the neck. The projecting angular-shaped ears are introduced into the slots of the neck. The neck and elliptical part are then pressed close together. The ears pass through and lock themselves in the slots, the result being that the complete knob is formed in such a manner that with ordinary wearthe two parts are inseparable. v

I will now proceed t`o describe, with reference to the accompanying drawings, the manner in which my invention is constructed.

Figure 1 represents the blank cut out of i'lat metal ready to stamp or otherwise form into the required shape. Fig. 2 represents in section the liat blank, Fig. 1, stamped, pressed,

or otherwise formed into the cup shape indi' cated. Fig. 3 represents the blank, Fig. 1,

still further stamped, pressed, or otherwise formed into a shape convenient to connect with the neck. Fig. 4 represents in section a complete knob, the elliptical portion being formed out of the plate, Fig. 1f, either of the necks, Figs. 6 or S, being connected thereto. Fig. 5 represents the blank cut out of ilat metal with serrated or scalloped edges. Fig. 6 represents a vertical elevation of neck without a groove. Fig. 7 represents a plan of Fig. 6. Fig. 8 represents a vertical elevation of neck with a groove. Fig. 9 represents a plan of Fig. 3, viewed in the direction of the arrow. Fig. 10 is a sectional plan of Fig. 4 on the line IOO alb. Fig. 1l represents a complete knob, the elliptical portion being formed out of the plate with scalloped edges.

In carrying out my invention I proceed in the following manner: I prepare my blanks, as illustrated at Fig. 1, with any convenient and suitable number of projecting ears, A. The blank is then stamped or otherwise formed into the shape represented in section at Fig. 2. The cup shape represented at Fig. 2 is then further manipnlated untilit takes about the form represented at Fig. 3. I then provide a neck, as represented at Fig. 8. This neck is, by preference, made of cast metal 5 but I can in some` cases make it by stamping, pressing, or in any other manner. The neck is formed at the bottom partto receive a square spindle, as represented at G in Fig. 7, or to receive a round spindle, as represented at D, Fig. 10; or it may be made to receive a spindle of any desited shape. The upper portion of the neck is in some cases formed into a groove, as rep-V resented at E, Fig. 8. In this groove are provided slots equal in number to the ears Aprovided onthe elliptical part. In some eases I dispense with the groove and leave a projecting flange, as represented at F, Fig. 6. The elliptical portion of the knob-that is to say, the upper portion-(represented at Fig. 3) is then placed over the neck. The ears A are introduced into the slots B. The neck and elliptical part are then pressed together, the ears A sliding through the slots B until the circular edge of the elliptical portion rests in the groove E or in the angle G formed by thejuncture of the projecting iiange F with the vertical part.

In some cases I prepare my manner shown at Fig. 5, with serrated edges. The blank would go through the shaping processes, as hereinbefore described in reference to theblank, Fig. 1, and when so connected to the neck would present the appearance replstance over blanks in the resented at Fig. 11, the extreme end of teeth or projections resting in the groove E of the neck or in the angle G.

The slots shown in plan, Fig. 7, are represented wider than the root of projections A. I prefer in some cases so to make them to allow for any irregularity in the expansion or contraction of the metal during the shaping processes shown at Figs. 2, 3, 9.

I wish to call attention to the fact that the slots are shown dotted through on plan, Fig. 7, which of course represents thatthere is subthe slots, for on this mainly consists the binding and securing power of the said slots on the ears.

I am fully aware that the making of knobs with the upper or elliptical part pressed or stamped, and then connected to a grooved neck, is old.

The knobs when made will be suitable for use on bedsteads and for many other purposes, but will be specially and particularly valuable used with door-locks.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim is- The within-described .knob consisting of a neck having its upper end formed with slots B, extending through the same and having side and top walls, and a plate, F, formed with ears A, and ofthe desired form,with said ears.

passing through the slots in the neck and having bearings against the side and top walls of the'slots, substantially as described.

In testimony whereof I have hereunto signed my name in the presence of two subscribing witnesses.

CHARLES PRIESTLAND.

Witnesses:

ALFRED WILLIAM TURNER, W. II. HARRIS. 

